A volume-of-fluid (VOF) interface-sharpening method for two-phase incompressible flows

Nguyen, Van-Tu; Park, Warn-Gyu

doi:10.1016/j.compfluid.2017.04.018

Cited by 51 publications

(13 citation statements)

References 26 publications

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“…Furthermore, the interface cells are partially filled with the liquid, thus the intermediate value between 0 and 1 are given there. The VoF method is mass-conserving, but as mentioned in the literature, the VoF method suffers from some interface diffusion, which can diffuse over several cells around the interface depending on the mesh resolution [31].…”

Section: The Vof Methodsmentioning

confidence: 99%

An improved Coupled Level Set and Volume of Fluid (i-CLSVoF) framework for droplet evaporation

Xia¹,

Kamlah²

2022

Preprint

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We present an improved Coupled Level Set and Volume of Fluid (i-CLSVoF) framework without explicit interface reconstruction for modelling micro-sized droplets with and without evaporation. A new surface tension force model with additional filtering steps is developed and implemented in the i-CLSVoF framework to suppress un-physical spurious velocities. Numerical benchmark cases demonstrate the excellence of the i-CLSVoF framework in reducing the un-physical spurious velocities. A simple yet efficient velocity-potential based approach is proposed to reconstruct a divergence-free velocity field for the advection of the free surface when the phase changes. The new approach fixes the numerical issues resulting from the evaporation-induced velocity jump at the interface. The smeared mass source term approach proposed in this work guarantees more numerical stability than the non-smeared approach.Two different evaporation models (constant mass flux and thermally driven evaporation models) are implemented into i-CLSVoF. Extensive numerical validations are conducted to validate the evaporation models.

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Section: The Vof Methodsmentioning

confidence: 99%

An improved Coupled Level Set and Volume of Fluid (i-CLSVoF) framework for droplet evaporation

Xia¹,

Kamlah²

2022

Preprint

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“…The VOF (volume of fluid) model, which can model two immiscible fluids by solving a single set of momentum equations and tracking the volume fraction of each of the fluids throughout the domain, was adopted. Typical applications of this model include the prediction of the motion of large bubbles in a liquid and the transient tracking of any gas–liquid interface. , …”

Section: Methodsmentioning

confidence: 99%

Gas–Liquid Taylor Flow Characteristics in a Fractal Microchannel Network during Numbering-up and Sizing-up

Zhang

Tang

et al. 2021

Ind. Eng. Chem. Res.

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In the present study, the characteristics of gas–liquid Taylor flow in a fractal microchannel network were investigated by numerical modeling and experiments. With perpendicular gas intake, the fractal design methodology resulted in uniform flow distribution. Unstable Taylor flow and saddle-shaped velocity profile were observed in a high-level branch with 0.3 mm width. The liquid slug exhibited different flow fields during splitting in the bifurcations of different levels. The significant size effects were further investigated in four channels representing different sizes (0.3, 0.6, 1.2, and 2.4 mm) via a μ-PIV and high-speed camera. The normalized slug length (LS /W) increased with the increasing gas–liquid flow rate ratio (jG /jL ), while the bubble length (LB /W) followed an opposite trend. The stability of the gas–liquid Taylor flow pattern became worse when the gas velocity increased beyond a certain value (Reynolds number Re > 220) under the microscale effect. Two typical counter rotating vortices were observed in the liquid slug, and the swirling strength increased exponentially with the jG /jL . It was found that both the velocity profile in the 0.3 mm channel deviated from the laminar flow. Particularly, a flow field similar to turbulence was observed in the 0.3 mm channel when the jG /jL reached 4. This work quantified the significant size effect in micro- and millichannels, providing theoretical basis for the effective scale-up of the microreactor.

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“…To reduce diffusion at the water/air interface local mesh refinement can be used which adds to the total computation time by mesh generating for each specified timestep. Indeed, the main drawback of the VOF simulation is that it exagerates the numerical interface diffusion [48]. We believe that the interface diffusion may underestimate the capillary force and then mislead the wicking dynamics simulation.…”

Section: Continuous Flowmentioning

confidence: 99%

Directional Water Wicking on a Metal Surface Patterned by Microchannels

et al. 2021

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This work focuses on the simulation and experimental study of directional wicking of water on a surface structured by open microchannels. Stainless steel was chosen as the material for the structure motivated by industrial applications as fuel cells. Inspired by nature and literature, we designed a fin type structure. Using Selective Laser Melting (SLM) the fin type structure was manufactured additively with a resolution down to about 30 μm. The geometry was manufactured with three different scalings and both the experiments and the simulation show that the efficiency of the water transport depends on dimensionless numbers such as Reynolds and Capillary numbers. Full 3D numerical simulations of the multiphase Navier-Stokes equations using Volume of Fluid (VOF) and Lattice-Boltzmann (LBM) methods reproduce qualitatively the experimental results and provide new insight into the details of dynamics at small space and time scales. The influence of the static contact angle on the directional wicking was also studied. The simulation enabled estimation of the contact angle threshold beyond which transport vanishes in addition to the optimal contact angle for transport.

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A volume-of-fluid (VOF) interface-sharpening method for two-phase incompressible flows

Cited by 51 publications

References 26 publications

An improved Coupled Level Set and Volume of Fluid (i-CLSVoF) framework for droplet evaporation

An improved Coupled Level Set and Volume of Fluid (i-CLSVoF) framework for droplet evaporation

Gas–Liquid Taylor Flow Characteristics in a Fractal Microchannel Network during Numbering-up and Sizing-up

Directional Water Wicking on a Metal Surface Patterned by Microchannels

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